Counterbalancing device for oven doors



June 1 1926.

G. A El. PICKUP COUNTERBALANCING DEVICE FOR OVEN DOORS Filed Feb. 16, 1925 Patented June 1, 1926.

Uhiipthti STATS GEORGE E. PICKUP,

Partnr rica COUNTERBALANCING DEVICE FOR OVEN DOORS.

Application led February 16, 1925.j Serial No. 9,547.

The invention has general reference to cook stoves, andinore especially refers to a counterbalancing means for the oven door of a cook stove. l

rlhe object of the invention generally stated is to produce a ,counterbalancing means Vof simple and economical construction which is adapted effectually to support the door. in its swingingmovements against the action of gravity, so `as to lfacilitate its operation.

More specifically, the invention has for its object the provision of a counterbalancine means which is noiseless in operation, which is compact so that it consumes little space and may be readily enclosed within the double wall structure commonly employed, and which is of a ldurable character, the spiinp; employed beingsubjected in use to very little strain.

In the accompanying drawings I have illustrated a preferred embodiment of my invention, but it is contemplated that various changes in the construction and arrange-` ment set forth may be made by those skilled in the art without departing,- from the spirit and scope of the invention as expressed in the appended claims.

Figure 1 of the drawings is a fragmentary front elevation of the oven section of a cook stove of the gas range type, to the doors of which my invention is applicable.

Fig. 2 is a vertical sectional view taken approximately in the plane of line 2-2 of Fig. 1, but on an enlarged scale.

Fig. 3 is affragmentary vertical sectional view taken approximately in the plane of,

line 3 3 of Fig. 2.

Fig. l is a similar view taken in the plane of line twat of Fig. 3 and showing the relation of they parts for the open position of the door which is indicated by dotted lines.

I have herein shown my counterbalancingp` means applied to the rectangularly shaped door 5 of the broiler oven of agas range of shoulder 12 which is'adapted to engage with the inner side of the frame 8 as shown in Fig'. Il to limit the forward and downward swinging` movement of the door.

The triangular member 11 has pivoted thereto at 11 eccentric-ally ofthe axis-ot' the trunnion t), a link 13 forming` one'arii'i of a toggle generally designated by the numeral Lt and of which the other arm is formed by a link 15 pivoted at its lower end to theliuk 13 and at its upper end to a projection 16 on the oven frame 8. Preferably the link 15 has a bent strap 17 secured thereto at one end with its free end spaced from the link 15 whereby to provide spaced alined bearings for a bolt 18 which latter passes through the inner end of the projection 16 entered between said bearings.

The link 13 has a rearward extension 19 of substantial length, and the link 15 has an upward extension 2O of relatively short length. These two extensions are connected at their free ends by means of a contractile spring 21, the lower or inner end of which is `anchored to thel extension 19 through one or the other of a rouT` of holes 22and the `upper or outer end of which is anchored to the extension 20 by means of a forwardly opening notch or recess 23.

It will be observed thatin the movement of the door vfrom the vertical position, shown in Fig. 2, outwardly and downwardly to the horizontal position shown in Fig. 4, the toggle let is bent against theaction of the spring` 21 and that in this movement of the door the eccentric pivot 11a ofthe triangular member 11 inoves upwardly and inwardly through an arc of approximately 90 degrees. The spring is thus placed under tension and acts to restrain the flexing of the toggle. In this operation'the link .1.3. and it OF NEWARK, OHO, ASSIGNOR T0 'I1-IE WEHRLE COMPANY, OF i NE'WARK, OHIO, A CORPORATION OF OHIO.` i

extension 19 constitute a lever ulcrumed lietvvecn its ends on the pivot connecting the link 1B with the linlr 15, and because the extension 19 is substantially longer than the link 1,3 ot 'the toggle very little power is necessary to be exerted by the spring to restrain the lexing ot the too'ole sufficiently to counterbalance the door.

Conversely as the door approaches its vertical position in the closing movement of 'the door, the spring acts toy straighten the to 'le 1i but notwithstanding the actt'hat during the final portion of the closingI movement the tension ot' the spring islrelatively slight it is able to complete the` closing movement of the ydoor through the function of the extension 1Qv and link i13 as a lever. `Also this iinal or closing movement of the door by the spring is facilitated by 'reason oit the upward extension 2O ot the link 15, forming with this Vlink a second lever fulcrumed on the bolt 13 and receiving the application of poiver at its extreme upper end.

1t will also be apparent that" the linlr 15 with its extensionQ and tl'ie extension 19 ot the linkfl, together cons titutea second toggle lil-Which the spring 21 tends to flex as'the iirst toggle 14; is straightened. Thus the link 1.5 forms apart of and is common to botchto'gglesI 14 and 2,4.

I claim 'as my invention 1. A count'erbalancing device for oven doors comprising a toggle having one arm pivoted to the door eccentrically of its turning axisand theothel'lrm pivoted to'turn on a fixed axis, a contractile spring, and means including a pair of levers of 'which the arms ot the toggle form parts operatively connected byv said spring and acting to resist the flexing ot the toggle and thereby restraining movement olf the door 4from upright to horizontalposition.

2. A counterbalan'cing means for oven doors comprising al toggle having one arm pivoted to the door eccentrically of its turning axis and its otherarm mountedto turn on a fixed pivot, and means including a lever of Which one ot' 'said toggle arms forms Aa. part and a' spring lassociate-d with said lever tending'to straighten the toggle'for all positions ot the door. l

3. c ounteibalancing means for oven doors comprising atog'gle vhaving one arm pivoted eccentrically yof' theW turning axis ot the door and the other yarm pivotally 'associated with the door trame,` the first mentioned arrn having an extension forming therewith a lever, and a spring acting upon said lever to yieldiiigly resist the swinging movements otsaid arms toward-each other.

11. c'ouiiterbalancing means for. Yoven doors comprising a'toggle having one arm dfeclceiitri'cally of 4'thetiirning axis of the, door and another armipivotall'yy 'asSOC having an extension forming therewith a lever, and a spring connecting the extensions of said arms.

5. A. counterbalancing means for oven doors or the like comprising a member rigid with the door 'so as to 'turn therewith, a toggle having one arm pivoted to said meinber eccentrically of ,the turning axis of the door, a stationary part to' 'ivhich the other arm oi. said' toggleis pivoted, one of said arms having a portion extending beyond itspivotal connecti'orfivith the other arm, and .a spring acting upon said extending portion tendingto straighten the toggle for all positions or' the door.

6. A` counterbalancii'ig means for oven doors or the like comprising member rigid with the'door so Ias toturn therewith, a toggle having one arm pivoted to sai-d membe'r--ecce'ntrvcally of the turning axis of the door, a stationary part to'which the arm of said toggleis pivoted, one of said arms havinga p'ortionextending beyond its pivotal connection the other arm,` and the other arm having a portion extending beyond its connection With the stationary support, and a spring connecting the extensions of the two arms. ,v t

7. 'A counterbalaiicing means for oven doors comprisingatoggle yhavi'iig one arm pivoted eccentrically of the turning axis of Athe door and its other arm pivotally associated with the door frame, and' means including .a spring tending to straighten the toggle for all positions ofv the door.

8.1i. counterbalancing means for oven doors coini'irising toggle lhaving' one arm pivoted ecce'ntri'cally of the turninofaxis' of the door and. itsother arin pivotaly associated with the door frame, a ysecondtoggle formed in part by, one of said arms and by an extension ot the other arm, anda spring tending to iiex said second toggle.

9.' A' counterbalancing means forl oven doors comprising a' toggle having one arm pivotally associated nfi'th'the doorl frame and its other arm operatively connectedwith the do'or,'and a spring acting upon said toggle whereby tol restrain themovements of said toggle arms 'tfoy'v'ar'd each otheras the door is opened.'

10. counterbalancing means for` oven doors comprising' a toggle having one rarm pivoted atene end to a stationary support and its other .arm having a portion rigid therewith operatively connected with the door, and a spring Icininecting the free ends otsaidtoggle y: trms tending to' flex'thein whereby to restrain'outtvardswinging movement ot thedoors, the arrangement being suchthat said rigid extellSion of one ofthe toggle arms'forms'wth the Othei tessleavf a second toggle Atvliich is straightened as ithe first mentions tegel@ is fleiss- -lt- Cer... helemaal ses ist sin krimesse 8 doors comprising a pair of members one of second member, the arrangement being such which is pivoted to the oven door eocenthat said second member constitutes one 10 trieally of its turning axis and the other of arm of tWo toggles of which the other arms which is pivoted at one end to the first menare formed by the first member.

tioned member between the ends of the letter In testimony whereof, I have hereunto and its other end to a stationary support, aixed my signature.

`and a. spring acting upon the free end of the first member to .sWin-g it relative to the GEORGE E. PICKUP. 

